The markers reportedly come from the Monumental Bronze and Granite Company in San Bernardino.

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Denver Cooley, who owns the company , told the newspaper that the gravestones were discarded because they are have mistakes on them so that had to be remade. Some of them had incorrect dates and others were marred by equipment failures.

Sheriff's deputies first thought the tombstones had been stolen from local cemeteries, but they checked with nearby cemeteries and none of them reported any missing markers.

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The deputies had gone to the home in Loma Linda on Tuesday to serve a search warrant as part of an investigation into possible drug sales.

Cooley said he gave the grave markers to a contractor who had remodeled his office to use in construction of a patio.

He said the represented some 20 years accumulation of tombstone mistakes.

One mystery, however, remains. How did the tombstones end up in the backyard of the house of John Orville Bleuer, 50, who was arrested on drug-related charges?